syzbot

Bluetooth: hci0: Opcode 0x0c03 failed: -110
============================================
WARNING: possible recursive locking detected
6.9.0-rc5-syzkaller-00053-ge33c4963bf53 #0 Not tainted
--------------------------------------------
kworker/u9:1/9228 is trying to acquire lock:
ffff888029782948 ((wq_completion)hci0){+.+.}-{0:0}, at: touch_wq_lockdep_map+0x6e/0x120 kernel/workqueue.c:3901

but task is already holding lock:
ffff888029782948 ((wq_completion)hci0){+.+.}-{0:0}, at: process_one_work+0x1296/0x1ac0 kernel/workqueue.c:3229

other info that might help us debug this:
 Possible unsafe locking scenario:

       CPU0
       ----
  lock((wq_completion)hci0);
  lock((wq_completion)hci0);

 *** DEADLOCK ***

 May be due to missing lock nesting notation

2 locks held by kworker/u9:1/9228:
 #0: ffff888029782948 ((wq_completion)hci0){+.+.}-{0:0}, at: process_one_work+0x1296/0x1ac0 kernel/workqueue.c:3229
 #1: ffffc900032ffd80 ((work_completion)(&hdev->error_reset)){+.+.}-{0:0}, at: process_one_work+0x906/0x1ac0 kernel/workqueue.c:3230

stack backtrace:
CPU: 0 PID: 9228 Comm: kworker/u9:1 Not tainted 6.9.0-rc5-syzkaller-00053-ge33c4963bf53 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
Workqueue: hci0 hci_error_reset
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:114
 check_deadlock kernel/locking/lockdep.c:3062 [inline]
 validate_chain kernel/locking/lockdep.c:3856 [inline]
 __lock_acquire+0x20e6/0x3b30 kernel/locking/lockdep.c:5137
 lock_acquire kernel/locking/lockdep.c:5754 [inline]
 lock_acquire+0x1b1/0x560 kernel/locking/lockdep.c:5719
 touch_wq_lockdep_map+0x78/0x120 kernel/workqueue.c:3901
 __flush_workqueue+0x129/0x1200 kernel/workqueue.c:3943
 drain_workqueue+0x18f/0x3d0 kernel/workqueue.c:4107
 destroy_workqueue+0xc2/0xaa0 kernel/workqueue.c:5673
 hci_release_dev+0x14e/0x660 net/bluetooth/hci_core.c:2808
 bt_host_release+0x6a/0xb0 net/bluetooth/hci_sysfs.c:94
 device_release+0xa1/0x240 drivers/base/core.c:2580
 kobject_cleanup lib/kobject.c:689 [inline]
 kobject_release lib/kobject.c:720 [inline]
 kref_put include/linux/kref.h:65 [inline]
 kobject_put+0x1fa/0x5b0 lib/kobject.c:737
 put_device+0x1f/0x30 drivers/base/core.c:3828
 process_one_work+0x9a9/0x1ac0 kernel/workqueue.c:3254
 process_scheduled_works kernel/workqueue.c:3335 [inline]
 worker_thread+0x6c8/0xf70 kernel/workqueue.c:3416
 kthread+0x2c1/0x3a0 kernel/kthread.c:388
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>